Photographic shutter



W. F. FOLMER. PHOTOGRAPHIC SHUTTER.

APPLICATION FILED APR. 7, I920- 1,402,486. Patented Jan. 3, 1922.

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3 A TTOR/VEY W. F FOLMER. PHOTOGRAPHIC SHUTTER.

- APPLICATION FILED APR. 7, |9Z0r 1 {102,486. Patented Jan. 3, 1922.

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3 A TTORNE Y UNITED STATES PATENT OFFICE.

WILLIAM F. FOLMER, OF ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAK COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

Specification of Letters Patent.

Patented Jan. 3, 1922.

Original application filed January 8, 1919, Serial No. 270,109. Divided and this application filed April 7,

1920. Serial No. 371,932

To all whom it may concern:

Be it known that I, VILLIAM'F. FOLMER of Rochester, in the county of Monroe and State of New York, have invented certain new and. useful Improvements in Photographic Shutters; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference numerals marked thereon.

My present invention relates to photography and more particularly to photographic shutters and it has for its object to provide a simple, durable and reliable shutter of the pivoted blade and cover blind type and one especially adapted to work from or in conjunction with other actuated mechanism, such as the film feeding devices of a camera. The same invention is disclosed in combination with such 'a camera mechanism in my copending application, Serial No. 270,109, filed January 8, 1919, of which this application is a division. To these and other ends the invention resides in certain improvements and combinations of parts, all as will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specification.

In the drawings:

Figure 1 is a fragmentary horizontal section through a camera box provided with a shutter constructed in accordance with and illustrating one embodiment. of my invention;

Figure 2 is a front view of the shutter plate, and 1 Figures 3 and 4 are rear views of the shutter plate and shutter mechanism showing the parts of the latter in different positions.

Similar reference numerals throughout the several views indicate the same parts.

In the application of this invention to the purposes set forth in my said co-pending case, the shutter is actuated and controlled by driving devices extended from film feeding mechanism operated by a crank so that a single movement of the latter feeds the film and then sets and trips the shutter to expose the film so fed. The present embodiment of the invention is therefore an automatic shutter as distinguished from a set shutter set through the manipulation of one member and separately tripped volnntarily by the operator. Such film feedmg devices and the operating member are not illustrated herein, A merely indicating a camera body having a lens tube B and a front wall C to which latter is secured a plate 1 on which the shutter mechanismis carr1ed; A shaft 2 supported in a bracket 3 on an inner wall of the camera extends horizontally from front to rear of the latter. A t'its forward end, the shaft 2 carries a disc 4 having an eccentric crank pin 5 thereon. This crank pin may be considered to constitute the connecting element between the operating crank and winding mechamsm, referred to, -on the one hand, and the shutter mechanism, on the other, and it actuates the shutter operating member hereinafter described.

The shutter mechanism is shown detached in Figures 3 and 4 and as before stated, is mounted entirely upon the shutter plate 1. The shutter comprises a shutter leaf or plate 6 loosely mounted on a shaft 7 and having an aperture 8 movable into and out of register with a-lens opening 9 in the shutter plate 1, the shaft 7 being mounted to turn in the plate. Fixed to the said shaft is a gear 10 fixed to a cover blind 11 adapted to swing across and close both of the aper tures 8 and 9. Meshing with this gear is a driving gear 12 loosely mounted on a pivot 13 and having a hub 14 provided with a notch 15. Also loosely mounted on the pivot 13 is an arm 16 having a spring actuated pawl 17 pivoted thereto at 18. In the arm 16 isa slot 19 with which cooperates the crank pin 5 on the disc 4 that is turned with the film feeding mechanism. Upon each throw of the operating crank of the camera, the crank pin 5 describes an are that carries the pawl 17 around from the full line position'of Figure 3 to theposition of Figure 4. As the pawl is normally in engagement. with the notch 15, this motion rotates both gears 12 and 10 and carries the cover blind 11 and shutter 6 from the normal full line position of Figure 3 to the dotted line set position. In doing this, the cover blind 11 first moves alone until it covers the aperture 8 in the shutter, at which point a pin 20 on the shutter plate is engaged by the end wall of a segmental slot throws it out of engagement with the notch 15. This permits the cover blind to returnunder the influence of a sprin 24 on the .frontof the late 1 (see Figure 2 which spring, during-t e setting movement, winds on a grooved pulley 25 fixed to the shaft 7 In so doing, the cover blind uncovers the aperture 8 of the shutterwhich is then in register with the lens aperture 9 and the exposure isstarted, but the the'positionpf Figure 4 due to the action of a spring actuatedcatch 26 pivoted at 27 to the plate 1 and locking into a notch 28 in the edge of the shutter. Immediately thereafter, however, a cam 29.0n the cover blind engages and trips thislatch just before the other end wall of the segmental slot 21 engages the pin 20 on the shutter to rotate it with the cover blind to normal position. In this way, the cover blind and shutter are returned in succession by the spring 24 and they are halted and the shock of the impact absorbed by a leaf spring 30 which engages the edge of the shutter. The shutter leaf 6 is normally locked in its closed position by the engagement of the latch 26 with another notch 31 in its edge. This engagement of the latch isalso released by the cam 29 on the cover blind when the latter is moving independently to set position. The operating arm16 and pawl 17 are, of course, returned by the operating crank of the camera and the pawl re-engages in the notch 15 of the gear 12.

To slow the exposing movements down to the desired duration. and to prevent a too choppy action under the influence of the spring 24, I employ a retarding mechanism which, in the present instance, comprises a gear train embodying a pinion 32' meshing with the gear 10 on the cover blind and gears 33', 34, 35 and 36 all set beneath a bear-. in plate 37. I

claim as m invention: 7

1. The combination with a shutter plate having a lens opening, of an apertured shutter blade mounted to swingacross the open ing and having a pin thereon, mounted to swing with the shutter and also; across the aperture thereof, a gear 00110611? blind and having a segmental slot therein slhitter maintains a cover blind to receive the pin on the shutter blade, and

means for rotating the gear to set the shutter blade through the medium of the pin.

2. The combination with a shutter plate having a lens opening, of an apertured shut ter blade mounted to swing across the opening, a cover blind mounted to swing with the shutter blade and also across the opening therein, a spring for actuating the cover blind in one directon, gearing for actuating it in the other, a rotary element including a pawl cooperating with the gearing an means for automatically tripping the pawl when the cover blind is in a predetermined position.

3. The combination with a shutter plate having a lens opening, of an apertured shutter blade mounted to swing across the openmg, a swinging cover blind adapted to operate the shutter blade and also to move independently across the 'openin therein, a spring adapted to operate the blmd in one direction, and a retarding gear train operatively connected to the cover blind.

4. The combination with a shutter plate 7 having a lens opening, of an apertured shutter blade mounted to swing across the opening, a cover blind mounted to swing with the shutter bladeand also across the opening therein, a spring for actuating the shutter. blade and cover blind in one direction and *a retarding gear train operatively connected to one of said members.

5. The combination with a shutter plate having a lens opening, of an apertured shutter blade mounted to swing across the open ing, a cover blind mounted to swing with the shutter blade and also across the opening therein, a gear secured concentrically t0 the cover blm a spring for operating the latter in one direction, operating means embodying a gear meshing with the first mentioned gear for operating the cover blind in the other direction, and a retarding-gear train also meshing with said first mentioned gear.

. 6. The combination with a shutter plate having a lens opening therein, of an apering-a pawl cooperating with the operating gear-tqmove it a ainst the tension of the spring and-means or automatically tripping gthe pawl at a. predetermined b-lads and cover blind. trically and fixedly mounted on the cover I position of the WILLIAM F. FOLMER. 

